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Changed the liveness tracking in the RegisterScavenger

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to use register units instead of registers.

reviewed by Jakob Stoklund Olesen.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214798 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pedro Artigas
2014-08-04 23:07:49 +00:00
parent db3ce56a58
commit 3da024594f
8 changed files with 116 additions and 114 deletions
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4
lib/CodeGen/TailDuplication.cpp
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@ -799,11 +799,9 @@ TailDuplicatePass::TailDuplicate(MachineBasicBlock *TailBB,
RS->enterBasicBlock(PredBB);
if (!PredBB->empty())
RS->forward(std::prev(PredBB->end()));
BitVector RegsLiveAtExit(TRI->getNumRegs());
RS->getRegsUsed(RegsLiveAtExit, false);
for (MachineBasicBlock::livein_iterator I = TailBB->livein_begin(),
E = TailBB->livein_end(); I != E; ++I) {
if (!RegsLiveAtExit[*I])
if (!RS->isRegUsed(*I, false))
// If a register is previously livein to the tail but it's not live
// at the end of predecessor BB, then it should be added to its
// livein list.